She is sitting out the game because of her injury.

She sits up late at night to study for her exams.

She is sitting down on the chair.

She sits down on the chair.

She is sitting up in bed and reading a book.

The sit-inners peacefully protested for their rights.

I did 50 sit-ups this morning.

She enjoys sitting still and meditating.

She sits still in the library, reading a book.

We had several sit-downs to discuss the project.